Improved help. Moving to 0.2.
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <pty.h>
#include "main.h"
enum
{
STDIN,
STDOUT,
STDERR
};
static void set_close_on_exec(int fd)
{
int res;
res = fcntl(fd, F_SETFD, FD_CLOEXEC);
if (res == -1)
error("Set close-on-exec failed");
}
static void give_terminal(int parent[], int child[])
{
struct termios tios;
struct winsize wsize;
int res;
int master, slave;
res = tcgetattr(1, &tios);
if (res == -1)
error("tcgetatttr");
res = ioctl(1, TIOCGWINSZ, &wsize);
if (res == -1)
error("ioctl TIOCGWINSZ");
res = openpty(&master, &slave, 0, &tios, &wsize);
if (res == -1)
error("openpty");
parent[STDIN] = master;
parent[STDOUT] = master;
parent[STDERR] = master;
child[STDIN] = slave;
child[STDOUT] = slave;
child[STDERR] = slave;
set_close_on_exec(master);
set_close_on_exec(slave);
}
static void give_pipes(int parent[], int child[])
{
int p_stdin[2]; /* from us to mpg321 */
int p_stdout[2]; /* from mpg321 to us */
int p_stderr[2]; /* from mpg321 to us, its stderr */
pipe(p_stdin);
pipe(p_stdout);
pipe(p_stderr);
parent[STDIN] = p_stdin[1];
parent[STDOUT] = p_stdout[0];
parent[STDERR] = p_stderr[0];
child[STDIN] = p_stdin[0];
child[STDOUT] = p_stdout[1];
child[STDERR] = p_stderr[1];
set_close_on_exec(parent[STDIN]);
set_close_on_exec(parent[STDOUT]);
set_close_on_exec(parent[STDERR]);
set_close_on_exec(child[STDIN]);
set_close_on_exec(child[STDOUT]);
set_close_on_exec(child[STDERR]);
}
int fork_app(char * const command[])
{
int p_parent[3];
int p_child[3];
int pid;
int res;
if (command_line.s_param.run_in_subterminal)
give_terminal(p_parent, p_child);
else
give_pipes(p_parent, p_child);
/* globals */
app_stdin = p_parent[STDIN]; /* For us to write */
app_stdout = p_parent[STDOUT]; /* For us to read */
app_stderr = p_parent[STDERR]; /* For us to read */
pid = fork();
switch(pid)
{
case 0: /* child */
res = dup2(p_child[STDIN], 0);
if (res == -1) error("Dup2 stdin");
res = dup2(p_child[STDOUT], 1);
if (res == -1) error("Dup2 stdout");
res = dup2(p_child[STDERR], 2);
if (res == -1) error("Dup2 stderr");
execvp(command[0], command);
error("Cannot execvp %s", command[0]);
case -1:
error("Failed fork");
default: /* parent */
close(p_child[STDIN]);
close(p_child[STDOUT]);
close(p_child[STDERR]);
}
return pid;
}